Question

Two identical billiard balls are rolling toward each other at the same speed. What will be true after they collide head–on?

Answer 1

They will be moving away from each other at the same speed.

Step-by-step explanation:

The final speed may be identical to the initial speed if the collision is perfectly elastic. The final speed will be zero if the collision is perfectly in-elastic.

In all likelihood, the final speed will be slightly slower than the initial speed.